Github user steveloughran commented on a diff in the pull request:
https://github.com/apache/spark/pull/9168#discussion_r54569902
--- Diff: core/src/main/scala/org/apache/spark/deploy/SparkHadoopUtil.scala
---
@@ -130,6 +130,21 @@ class SparkHadoopUtil extends Logging {
UserGroupInformation.loginUserFromKeytab(principalName, keytabFilename)
}
+ def addCredentialsToCurrentUser(credentials: Credentials,
freshHadoopConf: Configuration): Unit ={
+ UserGroupInformation.getCurrentUser.addCredentials(credentials)
+
+ // HACK:
+ // In HA mode, the function FileSystem.addDelegationTokens only
returns a token for HA
+ // NameNode. HDFS Client will generate private tokens for each
NameNode according to the
+ // token for HA NameNode and uses these private tokens to communicate
with each NameNode.
+ // If spark only update token for HA NameNode, HDFS Client will use
the old private tokens,
+ // which will cause token expired Error.
+ // So:
+ // We create a new HDFS Client, so that the new HDFS Client will
generate and update the
+ // private tokens for each NameNode.
+ FileSystem.get(freshHadoopConf).close()
--- End diff --
turns out that `FileSystem.newInstance()` can also be used. This is Hadoop
2.x+, so can't be used in code that's also designed to compile against Hadoop
1.x
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